Abyss: The Wraiths of Eden has been available on Steam for Windows since October 2012, but now the game is also available on Linux.
There was no official announcement regarding the release of the Linux version, but the one mentioning the 30% discount.
“Discover and investigate a forgotten underwater city built in an intriguing Art-Deco style. This former utopia hides many spine-chilling secrets and supernatural forces, the remains of which still lurk in every corner.
Face the ancient evil that is hiding in the deepest chambers of the city of Eden,” say the developers on the Steam website.